I'm trying to understand how a portal style game engine works by writing one myself using openGL. I have written code that generates a leafy-BSP tree, but I'm not sure how you get portals out of it. I'm also unclear how you determine if a polygon is inside or outside the world or inside another brush (how is level flooding done?). Does anyone know of a website or book which gives detailed explainations on the techniques used to build a portal engine? Pretty much all the websites I've found so far only give a superficial explanation on how this is done.
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